25-hydroxyvitamin D (25-OHVD):
Vitamin D is an indispensable vitamin and nutrient in the human body, which not only regulates calcium and phosphorus metabolism, but also promotes the regulation of calcification of bones, and facilitates the formation and growth of bones. 25-OHVD can be measured to know whether the body is deficient in vitamin D. It is relatively stable in the human body with a high concentration, which is not affected by the blood levels of calcium and parathyroid hormone, and reflects the total amount of vitamin D consumed by food and synthesized by the body, as well as the ability to convert vitamin D. The concentration of vitamin D in the human body is high, and is not influenced by blood levels of calcium and parathyroid hormone. It reflects the total amount of vitamin D consumed in food and synthesized by the body, as well as the ability to convert vitamin D. In addition, when 25-OHVD level decreases, it will affect the body's absorption of calcium ions, which in turn will hinder bone mineralization and bone matrix formation, and ultimately lead to osteoporosis. 25-OHVD concentration is widely recognized as a better indicator to objectively evaluate vitamin D level.
25-OHVD has a protective effect against osteoporosis, and PTH is a risk factor for the occurrence of osteoporosis. The combination of the two tests can evaluate and monitor the changes in bone metabolism, and has the advantages of reflecting the changes in bone turnover in a sensitive, rapid and dynamic manner, and is therefore widely used in the clinic.